In the one into which Peter unsuspectingly sank the springs were broken, and he hit the backs of his knees against the wooden frame.
彼特不经意地坐下去，那椅子
弹簧一下就
，
膝背竟打在椅子木框架上。
词
过去式和过去分词;In the one into which Peter unsuspectingly sank the springs were broken, and he hit the backs of his knees against the wooden frame.
彼特不经意地坐下去，那椅子弹簧一下就，膝背竟打在椅子木框架上。
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